Your opponent's, as much as I have been bashing Mind's Dilation, I have added it because the effect is nuts when it's a 3 mana card with Aminatou's Miracle trigger is doing the heavy lifting
His mechanic, allowing you to draw up to an opponent's hand size or cheat in a creature when he attacks , isn't a great match for the rest of the deck
Mana composition: rocks, dorks, treasure engines, or commanders that generate mana so one extra is less painful
Some players want explosive mana combos, while others may prefer grinding value or overwhelming opponents with tokens
Ral, Monsoon Mage is a really cheap cost reducer for just two mana
Quandrix Unlimited (blue-green) Commander: Zimone, Strategy: Flood the board with fractals, hydras, and other creatures with variable stats and pummel the opponent